Aquatic Animal Welfare

Sea Lice and Salmon Welfare in Aquaculture

Sea lice infestations are one of the most significant welfare challenges in Atlantic salmon farming, causing pain, tissue damage, and secondary infections.

Key Facts

Sea lice cause lesions and can expose salmon to secondary infections
Chemical treatments for sea lice have welfare and environmental impacts
Cleaner fish like wrasse and lumpfish are widely used but face their own welfare concerns
Non-medicinal treatments including freshwater bathing cause acute stress
Sea lice have developed resistance to several chemical treatments

Welfare Considerations

Sea lice represent a chronic welfare problem for farmed salmon. The lice themselves cause suffering, and the treatments used carry additional welfare costs. Cleaner fish used as biological control face high mortality rates and welfare challenges of their own. Integrated pest management combining selective breeding, non-medicinal treatments, and biosecurity is the welfare-improving direction.

What You Can Do

Choose salmon from farms with verified low sea lice counts
Support organizations like the Fish Welfare Initiative working on salmon welfare
Reduce farmed salmon consumption or choose higher-welfare alternatives
Advocate for welfare standards that include lice burden monitoring